Insert butterfly, add yolk, mustard, vinegar, honey, salt and pepper to mixer bowl. Mix for 1 min/37°C or 100°F/speed 4/MC on..
Set mixer to 3 mins/37°C or 100°F/speed 4 and VERY slowly start drizzling oil into bowl. Take the full 3 minutes to do so. Scrape bowl out and set aside in the fridge.
I use the avocado oil from Costco. If you don't have a costco near you, I recommend you use Cobram extra light tasting olive oil as the avocado oil from supermarkets is pretty gross! To Store: 3-5 days in a sterilised jar in the fridge.